transceiver radio pumipito when accelerating

[boybi]

my transceiver radio produces a whistling sound when i accelerate. but when the aircon is turned off, mas mahina yung sound. sabi ng technician, static daw yun. is there a way na matanggal yang whistling sound na yan? the power of the radio is connected directly to the car battery.

[Quickbjorn]

sir pabago mo yung wiring. It will help a lot.

[Ungas]

Kung ayaw mo mag re-wire, may kinakabit na attenuator dyan sa radio. Para mabawasan yung static sound.

[yebo]

try connecting a capacitor, 15 volts 1000 mFd between the positive terminal ng power input and ground. this will act as a filter and filter out the static.

[boybi]

Originally posted by yebo
try connecting a capacitor, 15 volts 1000 mFd between the positive terminal ng power input and ground. this will act as a filter and filter out the static.

positive and ground? di po ba ma-short yung connection?

and how do i connect the capacitor? i-tap ko lang ba sa wire? meron kasing fuse yung line, after the fuse ba i-connect yung capacitor or before the fuse? thanks.

[yebo]

pare ang capacitor talagang between positive and negative (in this case yung ground connection) ang kabit nyan. "shorted" talaga sya between the two terminals. inside the capacitor are 2 plates wound on top of the other (parang double helix) and in between the 2 plates is a separator (non-conductive). walang physical connection between the 2 plates kaya hindi sya shorted. there will just be a build up of electrical charge between the 2 plates.

capacitors have 2 uses. it stores electrical energy. it also acts as a filter for unwanted frequencies in the electrical circuit. kasi pag pasok ng static (an electrical surge) dun sa capacitor pag labas nya it will be in the same voltage as the average voltage so filtered out na sya.
parang battery in parallel ang kabit ng capacitor, + terminal to the + lead, - terminal to the - lead of your radio.

if you can get 20V 1000mFd mas ok kasi minsan umaabot ng +15 volts sa car.

[yebo]

doesn't matter kung before of after the fuse. basta yung positive terminal ng capacitor is connected to the positive lead, the negative terminal to the negative (or ground) lead. saka put it where hindi sya masikip as it also gives off some heat lalo na kung matindi ang static. an inch of space around the capacitor is enough, basta wag lang in contact with other stuff.

[paolorenzo]

I've read in the competitor's forum about the exact same problem. Parang nag-rewire siya. He sparated the speaker wires with the power wire, kasi dating magkatabi. Pinagapang niya in another path yata yung power wire...

Parang ganun yung nabasa ko ha... Hmmm...

[Ungas]

Dapat naman hiwalay talaga ang power wires sa speaker wires. Professional audio gurus install it in separate paths.

[boybi]

yebo, thanks, try ko maglagay ng capacitor.

[boybi]

i went to see the technician who installed my radio and asked if ok bang magkabit ng capacitor sa radio, ang sabi nya baka daw tumaas yung voltage na papasok sa radio. is this true? but before i went to the technician, bumili muna ako ng capacitor, 16V 1000mFd, P7.00 lang pala ito?

[yebo]

Nope, not true.

capacitor is 16 volts, 1000 mFd - meaning rating is 16 volts. if the input is higher than 16 volts, iinit yun capacitor so baka pumutok. pag 16 volts or less ang input, ok lang.

alternator voltage maximum = 15.6 volts. yan ang papasok sa capacitor. pag labas nyan, 15.6 volts pa din. kahit na 20 volts pa ang rating ng capacitor, 15.6 pa rin ang lalabas.

ang sinasabi nyang tataas ang voltage eh pag ac to dc conversion. e rectified na yung voltage pag labas sa alternator eh, constant dc na yun hindi na sinusoidal yung wave form ng voltage.

[boybi]

tama ba na yung longer terminal ng capacitor ang positive side? try ko i-DIY tomorrow, ok lang ba i-tap ko lang dun sa me part ng fuses para hindi muna ako mag splice?

[GlennSter]

boybi...separate the speaker and the power wires...

second...

check THE GROUNDING WIRE AND THE GROUNDING POINT!!!

dapat walang paint talagang tinatamaan ang terminal niyang ground sa body..liha ng maigi yaN.

[boybi]

GlennSter, VHF Transceiver radio yung nagkaka-static sound. and the power is connected directly to the battery terminals.

[revoGSX]

Originally posted by yebo
try connecting a capacitor, 15 volts 1000 mFd between the positive terminal ng power input and ground. this will act as a filter and filter out the static.

i'm not an engineer but i don't think 16V or 20V capacitor si safe to use inside the car... try at least 50V or 100V .. most capacitors inside the car radios are at least 50V .. meron kasi surge ata ng voltage/current minsan..

sa mga may alam..paki-correct na lang po ako

[yebo]

sir, sabi ko nga the higher the voltage rating mas maganda. anyway, mag-leak lang naman or worst, puputok yung capacitor if ever di kaya ang voltage surge.

pero cars today na don't have those old style voltage regulators that cause those voltage surges anymore. electronic na so pag nag-fail yun regulator, 0 voltage output lang labas ng alternator. so kahit 16V lang kaya na. di gaya nung mga luma na voltage regulators na may contact point pag nag-fail yun may chance na pundido mga headlights mo kasi abot ng 50V ang output ng alternator.

so assuming na electronic na ang voltage regulator ni boybi (yun IC type) e safe yung capacitor kahit 16V lang yun binili nya.

[boybi]

malamang IC type na siguro yung regulator ng GU Patrol?

di ko parin na-try

[afrasay]

kailan mo ba na notice yan? nun unang kinabit yan may static na ba?ano ba ginawa before nangyari yan?daming tanong no?

[yebo]

di kaya may kuliling lang sa tenga si boybi ehehehehehe! tingalingaling!

joke lang! :D